def fun1(a,b):
    try:
        a/b
    except Exception as e:
        print(e)
        print('b不能是0---!!!!!----')
#   ZeroDivisionError: division by zero


def fun2(a,b):
    fun1(a,b)

def fun3(a,b):
    fun2(a,b)

#  fun3(fun2) --> fun2(fun1) --> fun1()
#  python 解释器 < 飘红 >
fun3(10,0)
